Average composition of the tonalite–trondhjemite–granodiorite association: Possibilities of application

The possibilities of using the average compositions of tonalite–trondhjemite–granodiorite association rocks (TTG), which make up a significant part of the Archaean continental crust, have been examined. The results of the TTG average compositions obtained by other researchers and the authors' d...

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Bibliographic Details
Published in:Doklady earth sciences 2017, Vol.472 (1), p.78-82
Main Authors: Chekulaev, V. P., Glebovitsky, V. A.
Format: Article
Language:English
Subjects:
Continental crust
Continental dynamics
Cratons
Crust (Geology)
Earth and Environmental Science
Earth Sciences
Geochemistry
Marine
Rocks
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Summary:The possibilities of using the average compositions of tonalite–trondhjemite–granodiorite association rocks (TTG), which make up a significant part of the Archaean continental crust, have been examined. The results of the TTG average compositions obtained by other researchers and the authors' data of the average compositions of TTG from the Baltic and Ukrainian shields and the entire Archaean crust are given. It is shown that the average compositions of the Archaean TTG of continental large crustal fragments (cratons or provinces) practically do not bear any information on their sources or conditions of their formation. The possibility of obtaining of such information by means of analysis of the average compositions of TTG, composing smaller fragments of the crust, exemplified by rocks of the Karelian subprovinces of the Baltic Shield has been demonstrated.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X17010135